The crop tool is available in canvas. It helps you cut what you don't want in your image and also expand your image with the help of refill.
Cropping your images
When you enable the Crop Tool (C) a settings screen will be visible at the bottom of your canvas. Alternatively you can hit the 'crop' button at the bottom right of your tool bar on the canvas page. Here you can:
Select one of the presets on top left side of the tool to guide your cropping
Set custom custom width and height and crop your assets in any size
To confirm your selection hit 'confirm' and complete your action.
Filling in blank areas.
When you want to extend your image, you can easily use the Cropping Tool and Layer will refill the empty areas magically. To refill:
Enable Crop tool with
C
or by clicking on the crop icon in the bottom toolbarExpand the cropping area bigger than your image hit.
Hit Refill in the crop options menu on the right.